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MFC 310315
[FreeBSD/stable/10.git] / sys / dev / hyperv / utilities / hv_util.c
1 /*-
2  * Copyright (c) 2014,2016 Microsoft Corp.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice unmodified, this list of conditions, and the following
10  *    disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/bus.h>
32 #include <sys/malloc.h>
33 #include <sys/systm.h>
34 #include <sys/sysctl.h>
35
36 #include <dev/hyperv/include/hyperv.h>
37 #include <dev/hyperv/include/vmbus.h>
38 #include <dev/hyperv/utilities/vmbus_icreg.h>
39 #include <dev/hyperv/utilities/vmbus_icvar.h>
40
41 #include "vmbus_if.h"
42
43 #define VMBUS_IC_BRSIZE         (4 * PAGE_SIZE)
44
45 #define VMBUS_IC_VERCNT         2
46 #define VMBUS_IC_NEGOSZ         \
47         __offsetof(struct vmbus_icmsg_negotiate, ic_ver[VMBUS_IC_VERCNT])
48 CTASSERT(VMBUS_IC_NEGOSZ < VMBUS_IC_BRSIZE);
49
50 static int      vmbus_ic_fwver_sysctl(SYSCTL_HANDLER_ARGS);
51 static int      vmbus_ic_msgver_sysctl(SYSCTL_HANDLER_ARGS);
52
53 int
54 vmbus_ic_negomsg(struct vmbus_ic_softc *sc, void *data, int *dlen0,
55     uint32_t fw_ver, uint32_t msg_ver)
56 {
57         struct vmbus_icmsg_negotiate *nego;
58         int i, cnt, dlen = *dlen0, error;
59         uint32_t sel_fw_ver, sel_msg_ver;
60         bool has_fw_ver, has_msg_ver;
61
62         /*
63          * Preliminary message verification.
64          */
65         if (dlen < sizeof(*nego)) {
66                 device_printf(sc->ic_dev, "truncated ic negotiate, len %d\n",
67                     dlen);
68                 return (EINVAL);
69         }
70         nego = data;
71
72         if (nego->ic_fwver_cnt == 0) {
73                 device_printf(sc->ic_dev, "ic negotiate does not contain "
74                     "framework version %u\n", nego->ic_fwver_cnt);
75                 return (EINVAL);
76         }
77         if (nego->ic_msgver_cnt == 0) {
78                 device_printf(sc->ic_dev, "ic negotiate does not contain "
79                     "message version %u\n", nego->ic_msgver_cnt);
80                 return (EINVAL);
81         }
82
83         cnt = nego->ic_fwver_cnt + nego->ic_msgver_cnt;
84         if (dlen < __offsetof(struct vmbus_icmsg_negotiate, ic_ver[cnt])) {
85                 device_printf(sc->ic_dev, "ic negotiate does not contain "
86                     "versions %d\n", dlen);
87                 return (EINVAL);
88         }
89
90         error = EOPNOTSUPP;
91
92         /*
93          * Find the best match framework version.
94          */
95         has_fw_ver = false;
96         for (i = 0; i < nego->ic_fwver_cnt; ++i) {
97                 if (VMBUS_ICVER_LE(nego->ic_ver[i], fw_ver)) {
98                         if (!has_fw_ver) {
99                                 sel_fw_ver = nego->ic_ver[i];
100                                 has_fw_ver = true;
101                         } else if (VMBUS_ICVER_GT(nego->ic_ver[i],
102                             sel_fw_ver)) {
103                                 sel_fw_ver = nego->ic_ver[i];
104                         }
105                 }
106         }
107         if (!has_fw_ver) {
108                 device_printf(sc->ic_dev, "failed to select framework "
109                     "version\n");
110                 goto done;
111         }
112
113         /*
114          * Fine the best match message version.
115          */
116         has_msg_ver = false;
117         for (i = nego->ic_fwver_cnt;
118             i < nego->ic_fwver_cnt + nego->ic_msgver_cnt; ++i) {
119                 if (VMBUS_ICVER_LE(nego->ic_ver[i], msg_ver)) {
120                         if (!has_msg_ver) {
121                                 sel_msg_ver = nego->ic_ver[i];
122                                 has_msg_ver = true;
123                         } else if (VMBUS_ICVER_GT(nego->ic_ver[i],
124                             sel_msg_ver)) {
125                                 sel_msg_ver = nego->ic_ver[i];
126                         }
127                 }
128         }
129         if (!has_msg_ver) {
130                 device_printf(sc->ic_dev, "failed to select message "
131                     "version\n");
132                 goto done;
133         }
134
135         error = 0;
136 done:
137         if (bootverbose || !has_fw_ver || !has_msg_ver) {
138                 if (has_fw_ver) {
139                         device_printf(sc->ic_dev, "sel framework version: "
140                             "%u.%u\n",
141                             VMBUS_ICVER_MAJOR(sel_fw_ver),
142                             VMBUS_ICVER_MINOR(sel_fw_ver));
143                 }
144                 for (i = 0; i < nego->ic_fwver_cnt; i++) {
145                         device_printf(sc->ic_dev, "supp framework version: "
146                             "%u.%u\n",
147                             VMBUS_ICVER_MAJOR(nego->ic_ver[i]),
148                             VMBUS_ICVER_MINOR(nego->ic_ver[i]));
149                 }
150
151                 if (has_msg_ver) {
152                         device_printf(sc->ic_dev, "sel message version: "
153                             "%u.%u\n",
154                             VMBUS_ICVER_MAJOR(sel_msg_ver),
155                             VMBUS_ICVER_MINOR(sel_msg_ver));
156                 }
157                 for (i = nego->ic_fwver_cnt;
158                     i < nego->ic_fwver_cnt + nego->ic_msgver_cnt; i++) {
159                         device_printf(sc->ic_dev, "supp message version: "
160                             "%u.%u\n",
161                             VMBUS_ICVER_MAJOR(nego->ic_ver[i]),
162                             VMBUS_ICVER_MINOR(nego->ic_ver[i]));
163                 }
164         }
165         if (error)
166                 return (error);
167
168         /* Record the selected versions. */
169         sc->ic_fwver = sel_fw_ver;
170         sc->ic_msgver = sel_msg_ver;
171
172         /* One framework version. */
173         nego->ic_fwver_cnt = 1;
174         nego->ic_ver[0] = sel_fw_ver;
175
176         /* One message version. */
177         nego->ic_msgver_cnt = 1;
178         nego->ic_ver[1] = sel_msg_ver;
179
180         /* Update data size. */
181         nego->ic_hdr.ic_dsize = VMBUS_IC_NEGOSZ -
182             sizeof(struct vmbus_icmsg_hdr);
183
184         /* Update total size, if necessary. */
185         if (dlen < VMBUS_IC_NEGOSZ)
186                 *dlen0 = VMBUS_IC_NEGOSZ;
187
188         return (0);
189 }
190
191 int
192 vmbus_ic_probe(device_t dev, const struct vmbus_ic_desc descs[])
193 {
194         device_t bus = device_get_parent(dev);
195         const struct vmbus_ic_desc *d;
196
197         if (resource_disabled(device_get_name(dev), 0))
198                 return (ENXIO);
199
200         for (d = descs; d->ic_desc != NULL; ++d) {
201                 if (VMBUS_PROBE_GUID(bus, dev, &d->ic_guid) == 0) {
202                         device_set_desc(dev, d->ic_desc);
203                         return (BUS_PROBE_DEFAULT);
204                 }
205         }
206         return (ENXIO);
207 }
208
209 int
210 vmbus_ic_attach(device_t dev, vmbus_chan_callback_t cb)
211 {
212         struct vmbus_ic_softc *sc = device_get_softc(dev);
213         struct vmbus_channel *chan = vmbus_get_channel(dev);
214         struct sysctl_oid_list *child;
215         struct sysctl_ctx_list *ctx;
216         int error;
217
218         sc->ic_dev = dev;
219         sc->ic_buflen = VMBUS_IC_BRSIZE;
220         sc->ic_buf = malloc(VMBUS_IC_BRSIZE, M_DEVBUF, M_WAITOK | M_ZERO);
221
222         /*
223          * These services are not performance critical and do not need
224          * batched reading. Furthermore, some services such as KVP can
225          * only handle one message from the host at a time.
226          * Turn off batched reading for all util drivers before we open the
227          * channel.
228          */
229         vmbus_chan_set_readbatch(chan, false);
230
231         error = vmbus_chan_open(chan, VMBUS_IC_BRSIZE, VMBUS_IC_BRSIZE, NULL, 0,
232             cb, sc);
233         if (error) {
234                 free(sc->ic_buf, M_DEVBUF);
235                 return (error);
236         }
237
238         ctx = device_get_sysctl_ctx(dev);
239         child = SYSCTL_CHILDREN(device_get_sysctl_tree(dev));
240         SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "fw_version",
241             CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, sc, 0,
242             vmbus_ic_fwver_sysctl, "A", "framework version");
243         SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "msg_version",
244             CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, sc, 0,
245             vmbus_ic_msgver_sysctl, "A", "message version");
246
247         return (0);
248 }
249
250 static int
251 vmbus_ic_fwver_sysctl(SYSCTL_HANDLER_ARGS)
252 {
253         struct vmbus_ic_softc *sc = arg1;
254         char verstr[16];
255
256         snprintf(verstr, sizeof(verstr), "%u.%u",
257             VMBUS_ICVER_MAJOR(sc->ic_fwver), VMBUS_ICVER_MINOR(sc->ic_fwver));
258         return sysctl_handle_string(oidp, verstr, sizeof(verstr), req);
259 }
260
261 static int
262 vmbus_ic_msgver_sysctl(SYSCTL_HANDLER_ARGS)
263 {
264         struct vmbus_ic_softc *sc = arg1;
265         char verstr[16];
266
267         snprintf(verstr, sizeof(verstr), "%u.%u",
268             VMBUS_ICVER_MAJOR(sc->ic_msgver), VMBUS_ICVER_MINOR(sc->ic_msgver));
269         return sysctl_handle_string(oidp, verstr, sizeof(verstr), req);
270 }
271
272 int
273 vmbus_ic_detach(device_t dev)
274 {
275         struct vmbus_ic_softc *sc = device_get_softc(dev);
276
277         vmbus_chan_close(vmbus_get_channel(dev));
278         free(sc->ic_buf, M_DEVBUF);
279
280         return (0);
281 }
282
283 int
284 vmbus_ic_sendresp(struct vmbus_ic_softc *sc, struct vmbus_channel *chan,
285     void *data, int dlen, uint64_t xactid)
286 {
287         struct vmbus_icmsg_hdr *hdr;
288         int error;
289
290         KASSERT(dlen >= sizeof(*hdr), ("invalid data length %d", dlen));
291         hdr = data;
292
293         hdr->ic_flags = VMBUS_ICMSG_FLAG_XACT | VMBUS_ICMSG_FLAG_RESP;
294         error = vmbus_chan_send(chan, VMBUS_CHANPKT_TYPE_INBAND, 0,
295             data, dlen, xactid);
296         if (error)
297                 device_printf(sc->ic_dev, "resp send failed: %d\n", error);
298         return (error);
299 }